Display Port Voltage Swing Adjustment for Thermal Compensation
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Solution Overview
Problem
Electronic devices, such as smartphones, generate heat during charging and computationally intensive operations, which affects the reliability of video data communication over display interfaces like DisplayPort and Mobility DisplayPort, leading to issues like jitter and data errors due to temperature sensitivity of electrical components.
Innovation Solution
The method involves a source device adjusting its output voltage swing and emphasis levels based on temperature thresholds, using temperature sensors or heat calculations to override initial link training settings, thereby ensuring reliable audio/video streaming by incrementing swing and emphasis levels when temperature exceeds a certain threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If charging current is received and computationally intensive operations are performed, then power delivery and processing capability are improved, but heat generation increases causing display interface communication errors
Solution Approach 1:
The patent changes transmission parameters (voltage swing and emphasis levels) based on temperature conditions. When temperature exceeds a threshold during high-power operations, the system adjusts these electrical parameters to compensate for heat-induced signal degradation, thereby maintaining communication reliability while continuing to deliver high power
Solution Approach 2:
The patent implements a feedback mechanism where temperature is monitored and used to dynamically adjust display interface transmission characteristics. The temperature threshold triggers a response that modifies transmission parameters, creating a closed-loop system that adapts to thermal conditions during charging and computation
2Reliability
If output voltage swing and emphasis levels are increased to compensate for heat, then signal reliability is improved, but power consumption increases
Solution Approach 1:
The patent makes transmission parameters dynamic rather than static. Instead of using fixed voltage swing and emphasis levels, the system continuously monitors temperature and adjusts parameters in real-time, increasing them only when thermal conditions warrant such changes and returning to baseline when cooling occurs, thereby optimizing the balance between reliability and power consumption
3Reliability
If temperature monitoring and dynamic parameter adjustment are implemented, then communication reliability under heat stress is improved, but device complexity increases
Solution Approach 1:
The patent establishes predetermined temperature thresholds and corresponding transmission parameter adjustments in advance. Rather than implementing complex real-time optimization algorithms, the system uses pre-configured response rules that trigger when temperature reaches known thresholds, simplifying the control logic while maintaining effective compensation for thermal effects
Data Source
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AI summary
A method of adjusting port parameters. A source device establishes an initial output voltage swing and an emphasis level for output signals from a display port interface as a result of executing a link training process with a target device. A processor determines that a prescribed temperature threshold has been exceeded by a source device temperature. The output voltage swing and emphasis levels are set to different output voltage swing and emphasis levels as a consequence of determining that the prescribed temperature threshold has been exceeded.